If list index exists, do X

Question

In my program, user inputs number n, and then inputs n number of strings, which get stored in a list.

I need to code such that if a certain

Answer 1

A lot of answers, not the simple one.

To check if a index 'id' exists at dictionary dict:

dic = {}
dic['name'] = "joao"
dic['age']  = "39"

if 'age' in dic

returns true if 'age' exists.